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I've never had success with the shimming--it has tended, in my case, to merely shift the vibration from one speed to another. I did, however, have success by crudely balancing the driveshaft on the car. Maybe it was just luck, but I started with the assumption that for the shaft to be out of balance it must be deformed in some way. With one rear wheel of the car safely lifted I ran the motor with the car in gear and scribed a mark of the driveshaft in front of the center bearing using an awl or similar--the awl scratched through the paint on one side of the shaft, marking the (presumably) heavier side. I attached a hose clamp with the heavy side opposite this mark and voila, no more shudder. After replacing the center bearing and the engine and transmission mounts a few weeks ago, I removed the hose clamp and the vibration was obvious as soon as I pulled out of the driveway. Who knows.
More common faults lie in the tailshaft bushing (wear makes the driveshaft wobble). But also check the engine and trans mounts--if they're shot the engine/trans can be an inch or so away from where it should be. Volvo did offer a tech bulletin about shimming the center bearing, and I know it suggested to go one way first then the other. Good luck!
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